Professor Greer Named Young Global Leader by the World Economic Forum
Julia R. Greer, Professor of Materials Science and Mechanics, has been selected as a 2014 Young Global Leader by the World Economic Forum. Each year the selection Committee, which is headed by Her Majesty Queen Rania Al Abdullah of the Hashemite Kingdom of Jordan, identifies and recognizes the most distinguished leaders under the age of 40, nominated from around the world. Candidates are selected based on their proven track record of professional accomplishments, breadth of their expertise, commitment to society and their ability to overcome adversity.
Julia R. Greer, Professor of Materials Science and Mechanics, and colleagues have created nanostructured, hollow ceramic scaffolds, and have found that the small building blocks, or unit cells, display remarkable strength and resistance to failure despite being more than 85 percent air. The general fabrication technique the researchers have developed could be used to produce lightweight, mechanically robust small-scale components such as batteries, interfaces, catalysts, and implantable biomedical devices. [Caltech Release]
Material's Spacing is Key to Brittle-to-ductile Transition
Julia R. Greer, her postdoctoral scholar Dr.Dongchan Jang, and colleagues have used experiments and atomistic simulations of nano-twinned metals (which have the unique combined effect of being strong and ductile) to decipher the specific role of the twin boundaries. They have found that it is the spacing between the twin boundaries that determines whether a material is brittle or ductile as opposed to the sample size, as would be expected. Greer states "this is probably the first study that truly isolated the twin boundaries by making samples which contained only twin boundaries, periodically spaced throughout the sample, and then tested them in tension. This understanding will help in the design of better structural materials and provide a certain amount of predictability in doing so, which has not been possible to date." [Nature Nanotechnology Article and Movies]